An incomplete fracture is a real break in the bone that stops partway instead of splitting it into separate pieces. So when someone says “it’s not completely broken,” it is still a fracture; the phrase describes the shape of the break. It is mainly a childhood injury, because a growing child’s bones can bend before they snap, the way a green twig does. Not every partial break is minor, though. How it’s treated depends on which kind it is and which bone is involved.
Why Children’s Bones Bend Instead of Snapping
In a typical complete fracture, at least one crack runs all the way across the full width of the bone.1PubMed Central. American Society of Biomechanics Journal of Biomechanics Award 2013: Cortical bone tissue mechanical quality and biological mechanisms possibly underlying atypical fractures A child’s bone is built differently. It is less dense and more porous than an adult’s, with more open channels running through it, so it can bend further before it breaks.2Royal Children’s Hospital Melbourne. What Is an Incomplete Fracture? Types and Treatment Young bone also holds more collagen, the flexible protein in bone, and less mineral, which lets it soak up more energy.3PubMed Central. Plastic Deformation of the Pediatric Forearm: Recognition, Radiographic Measurement, and Management Force that would snap an adult bone only bends or partly cracks a child’s. As children grow, bone gets denser and stiffer, and partial breaks become less common as the skeleton matures.
Most of these injuries start with a fall onto an outstretched hand, at the playground, on a trampoline or off a bike. The wrist and forearm take the force first, so those bones are involved most often.
Because young bone bends before it fails, the injury can look mild from outside. The arm may not look crooked even though the bone has a partial break. Children also often keep using the arm and cry less than you’d expect, so parents commonly wait a day. Swelling, tenderness at one spot, or refusing to use the arm are all reasons to get an X-ray.
Children have a thicker, stronger outer sleeve around the bone, though it is loosely attached.4Royal Children’s Hospital Melbourne. What Is an Incomplete Fracture? Types and Treatment5pmmonline.org. Fractures That sleeve does much of the work of healing a child’s fracture.6pmmonline.org. Fractures The same kind of force in an adult more often tears tendons, ligaments or muscles instead.7pmmonline.org. Fractures
The Three Main Types in Children
A buckle fracture, also called a torus fracture, is the bone’s surface crumpling inward from being squashed end to end, most often near the wrist. The bone stays in line and the injury is stable, which is why it is the mildest type.
A greenstick fracture breaks through one to three sides of the bone while the remaining side only bends, like a tongue depressor that splinters but doesn’t snap in two.8Australian Journal of General Practice. Guide to paediatric forearm fractures It usually comes from bending and twisting together, as in a fall from a height or during sports and play, and both forearm bones, the radius and ulna, are often hurt at once.9Australian Journal of General Practice. Guide to paediatric forearm fractures Unlike a buckle fracture, a greenstick break is unstable and can keep shifting even after the first 2 weeks.10PubMed Central. Distal radius fractures in children: substantial difference in stability between buckle and greenstick fractures
In a bowing injury, the bone bends permanently without any crack forming.11PubMed Central. Plastic Deformation of the Pediatric Forearm: Recognition, Radiographic Measurement, and Management It is seen especially in the forearm and lower leg bones of children.12PubMed. Ratio between mature and immature enzymatic cross-links correlates with post-yield cortical bone behavior: An insight into greenstick fractures of the child fibula Because the outer wall isn’t broken, the X-ray shows an unusual curve rather than a fracture line.13PubMed Central. Plastic Deformation of the Pediatric Forearm: Recognition, Radiographic Measurement, and Management That makes it easy to miss, and doctors may compare it with an X-ray of the other arm.
The type matters more than the word “incomplete,” because it decides whether a splint is enough or closer follow-up is needed. With a buckle fracture the arm usually looks straight, with swelling and tenderness over one spot near the wrist. A greenstick break or bowing injury may leave the forearm visibly bent or angled, which is a reason the doctor may want to straighten it. Looks can mislead, so the X-ray, not the appearance of the arm, decides which type it is.
Treating a Buckle Fracture
Buckle fractures of the wrist heal well whether they are treated with a soft bandage, a splint or a cast.14PubMed Central. Soft bandage, splint or cast as the treatment of distal forearm torus fracture in children: a systematic review and meta-analysis Children in removable splints functioned better and had less trouble bathing than those in casts, with no refractures.15PubMed. A randomized, controlled trial of removable splinting versus casting for wrist buckle fractures in children A splint may hurt a little more in the first week than a cast.16PubMed Central. Soft bandage, splint or cast as the treatment of distal forearm torus fracture in children: a systematic review and meta-analysis After that, splinted children tend to get back to their activities faster and have fewer problems with the device itself.17PubMed Central. Soft bandage, splint or cast as the treatment of distal forearm torus fracture in children: a systematic review and meta-analysis Families with casts more often made unplanned ER trips for wet or uncomfortable casts.18PubMed. Splinting versus casting of “torus” fractures to the distal radius in the paediatric patient presenting at the emergency department (ED): a literature review And X-rays at 4 weeks showed all had healed in line, so repeat X-rays are often unnecessary.19PubMed. Splinting versus casting of “torus” fractures to the distal radius in the paediatric patient presenting at the emergency department (ED): a literature review
Because a buckle fracture is stable, the device only needs to protect the wrist from knocks and ease pain. Whether a splint or a cast is used still depends on the clinic and the child, so it is fair to ask which is planned and why. The tradeoff with a removable splint is that the family has to keep it on as instructed, since a child may be tempted to leave it off.
At home, use the splint as instructed and take it off only for bathing if that’s allowed. Over-the-counter pain relief such as ibuprofen, given as directed, helps for the first days. Keeping the arm raised on a pillow early on eases swelling. Go back if pain gets worse or the fingers turn pale or numb.
Most children wear the splint for about three to four weeks, and pain usually fades well before that. Rough sports usually wait a couple more weeks after the splint comes off; ask your doctor when your child can return.
Treating a Greenstick or Bowing Injury
Because a greenstick break can keep shifting, it’s usually put in a cast and checked with follow-up X-rays. If the angle is too great, the doctor gently straightens the bone, usually with numbing or sedation. A bone healing at too sharp an angle can limit how well the wrist and forearm turn, so the aim is to bring it back closer to straight. Parents can ask which kind of numbing or sedation is planned and how long the child will be monitored afterward.
Specialists disagree on whether to finish the break while straightening it or to keep the intact side for stability.20Journal of Bone and Joint Surgery. Fracture Both Bones Forearm in Children Finishing means the doctor completes the partial crack on purpose, turning it into a full break that is easier to set and hold. The reasoning is that the intact side can act like a spring and tug the bone back toward its old bend, so finishing it may lower the risk of slipping again. Neither approach has been proven better in trials, so the choice is a judgment call for the treating doctor.21Journal of Bone and Joint Surgery. Fracture Both Bones Forearm in Children A bowing injury is judged by how curved the bone is, since there’s no crack to see.22PubMed Central. Plastic Deformation of the Pediatric Forearm: Recognition, Radiographic Measurement, and Management
Expect a repeat X-ray about one to two weeks in to check the bone hasn’t slipped. If it has moved, the cast may be changed or the bone re-set. Keep the appointment even if your child seems fine. Cast time is usually around four to six weeks.
The first one to two weeks are the riskiest for slipping, because swelling shrinks and leaves the cast looser. A loose cast is a reason to call rather than wait for the appointment.
Keep the cast dry; a bag over it in the shower helps. Never push objects inside to scratch. Seek care for a bad smell, rising pain, or swollen, cold fingers.
Will a Slightly Bent Bone Straighten Out
A child’s bone that heals at a slight angle can straighten over time as it grows.23PubMed Central. Remodelling in Children’s Fractures and Limits of Acceptability About three-quarters of that correction happens at the growth plate near the bone’s end, and the rest along the shaft.24PubMed Central. Remodelling in Children’s Fractures and Limits of Acceptability Correction is strongest near the growing end of the bone and in the direction the nearby joint moves.25PubMed Central. Remodelling in Children’s Fractures and Limits of Acceptability This ability shrinks as the child gets older, so doctors accept more angle in a young child than in a teen.26PubMed Central. Remodelling in Children’s Fractures and Limits of Acceptability Correction happens over months of growth, so parents may be told to watch and wait rather than re-set a bone that is only a little crooked.
A visible bend in the arm months later is worth a recheck. Rotation problems, like trouble turning the palm up, don’t correct as well. Your doctor tracks this at follow-up.
Incomplete Fractures in Adults Stress Fractures
In active people, heavy repeated training speeds up the bone’s normal rebuilding, temporarily weakening it.27PubMed Central. Mechanisms and management of stress fractures in physically active persons The bone becomes more likely to develop a stress fracture, a small crack that may not cross the whole bone.28PubMed Central. Mechanisms and management of stress fractures in physically active persons The typical story is someone who suddenly raises running distance, speed or frequency, so the bone has no time to adapt. Stress fractures most often show up in the weight-bearing bones of the lower leg and foot, because they absorb repeated impact, and too little rest between sessions makes the weakening matter more.
Warning signs are pain that builds during activity and eases with rest, and a spot on the bone that’s sore to press. Pain at night or at rest is a reason to stop and get checked.
On a scan, MRI can show early “stress reactions” before any crack appears and spots fracture lines very reliably.29PubMed. Diagnostic accuracy of magnetic resonance imaging versus computed tomography in stress fractures of the lumbar spine A crack may not show on a first X-ray, and in young children ultrasound has found leg fractures plain X-rays missed.30PubMed. Use of Point-of-Care Ultrasound to Identify Occult Fractures of the Tibia in the Pediatric Emergency Department: A Case Series If the pain pattern fits, a doctor may treat it as a stress injury anyway or order an MRI. A normal first X-ray does not rule out a stress fracture, and a repeat later may show the healing.
Before running again, the bone should no longer be tender, walking should be pain-free, and strength tests should be passed.31PubMed Central. Criteria and Guidelines for Returning to Running Following a Tibial Bone Stress Injury: A Scoping Review Higher-risk stress fractures need X-ray or scan evidence of healing first, and some need surgery.32PubMed Central. Criteria and Guidelines for Returning to Running Following a Tibial Bone Stress Injury: A Scoping Review33PubMed. High-Risk Stress Fractures: Diagnosis and Management Return usually starts with walk-run intervals, building distance before speed, and backing off if pain returns.34PubMed Central. Criteria and Guidelines for Returning to Running Following a Tibial Bone Stress Injury: A Scoping Review
Long-term use of bisphosphonates, common osteoporosis drugs such as alendronate, rarely causes an atypical femoral fracture, a stress fracture of the thighbone.35PubMed. Bisphosphonate-related atypical femoral fracture: Managing a rare but serious complication36PubMed Central. The enigma of atypical femoral fractures The drugs protect healthy bone but may stop a stress crack from healing.37PubMed Central. The enigma of atypical femoral fractures Such cracks can be present in people with no symptoms.38PubMed. Frequency of incomplete atypical femoral fractures in asymptomatic patients on long-term bisphosphonate therapy In one long-term follow-up, about 3 in 10 partial cracks grew and about 1 in 3 people went on to a full displaced break.39PubMed. Natural history of incomplete atypical femoral fractures in patients after a prolonged and variable course of bisphosphonate therapy-a long-term radiological follow-up In a small group treated without surgery, five of six progressed to a full break, on average within 10 months.40PubMed Central. Nonoperative versus prophylactic treatment of bisphosphonate-associated femoral stress fractures
If you take a bisphosphonate, don’t stop it on your own; its fracture protection usually outweighs this rare risk. Report a new dull ache in the thigh or groin, even with no injury. Your doctor may X-ray both thighs, since it can affect both sides, and preventive surgery with a rod may be advised for a crack likely to progress.